PLEASE HELP! Select the correct answer.
The Richter scale measures the magnitude, M, of an earthquake as a function of its intensity, I, and the intensity of a reference earthquake Io.
M = log( I/Io)

Which equation calculates the magnitude of an earthquake with an intensity 10,000 times that of the reference earthquake?

A. M =
log(I/10,000)

в.
M = log(10,000/Io)

C.
M = log(1/10,000)

D
M =log(10,000)

answer: i think it is (1,-2)

2x + 8

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -